What powers 
cas.cz?
Last seen Oct 2026 · 270 technologies across 45 categories
Advertising
Twitter Ads
since Jun 2021
Analytics
Branch
since Sep 2026
GoatCounter
since Aug 2022
Google Analytics
since Jun 2018
Matomo Analytics
since Apr 2022
Plausible
since Feb 2022
Authentication
Caching
Redis Object Cache
since Jan 2026
WordPress Super Cache
since Aug 2018
CDN
cdnjs
since Nov 2021
Cloudflare
since Nov 2021
Google Hosted Libraries
since Feb 2022
jQuery CDN
since Feb 2022
jsDelivr
since Oct 2020
Unpkg
since Jul 2021
CMS
Comment systems
Cookie compliance
CookieYes
since Apr 2022
Databases
DMS
Ecommerce
Editors
DreamWeaver
since Aug 2022
Microsoft Word
since Jun 2019
Sendgrid
since Sep 2024
Font scripts
Hosting
Drupal Multisite
since May 2022
Issue trackers
Sentry
since Nov 2022
JavaScript frameworks
AMP
since Sep 2026
Emotion
since Nov 2023
GSAP
since Jan 2024
Next.js App Router
since Mar 2026
Sencha Touch
since Sep 2026
Svelte
since Dec 2022
Vue.js
since Sep 2021
Zone.js
since Jun 2020
JavaScript graphics
amCharts
since Feb 2022
JavaScript libraries
Axios
since Sep 2021
Clipboard.js
since Aug 2018
decimal.js
since Nov 2023
FilePond
since Oct 2025
Highlight.js
since Mar 2024
Howler.js
since Apr 2023
Htmx
since Oct 2026
Isotope
since Dec 2021
jQuery Migrate
since Aug 2018
LazySizes
since Mar 2024
Lightbox
since Aug 2018
List.js
since Nov 2022
OWL Carousel
since Jul 2017
prettyPhoto
since Aug 2018
Select2
since Aug 2022
Slick
since Sep 2021
Slimbox 2
since Aug 2022
Splide
since Aug 2023
SweetAlert2
since Oct 2025
Swiper
since Sep 2022
Tippy.js
since Aug 2025
Maps
Google Maps
since Aug 2018
Marketing automation
Sendinblue
since Oct 2026
Miscellaneous
Babel
since Mar 2020
HTTP/3
since Dec 2024
Nextcloud
since Nov 2024
Open Graph
since Sep 2022
parcel
since Oct 2025
PDF.js
since Apr 2022
Popper
since Sep 2021
Prism
since Nov 2024
PWA
since Aug 2022
RSS
since Dec 2022
Sprig plugin
since Oct 2026
SWC
since Oct 2025
SWFObject
since Jan 2019
Vite
since Apr 2025
Webpack
since Feb 2019
Mobile frameworks
Network storage
Synology DiskStation
since Sep 2026
Operating systems
CentOS
since Aug 2018
Debian
since Aug 2018
FreeBSD
since Mar 2020
Red Hat
since Aug 2018
Scientific Linux
since Aug 2022
SUSE
since Dec 2020
Ubuntu
since Nov 2016
UNIX
since Jan 2019
Windows Server
since Aug 2018
Page builders
Visual Composer
since Oct 2025
WordPress Block Editor
since Jul 2024
WordPress Site Editor
since Oct 2024
Performance
Photo galleries
Imagely NextGEN Gallery
since Jun 2023
PhotoSwipe
since Sep 2022
Programming languages
Rich text editors
RUM
Cloudflare Browser Insights
since Sep 2026
New Relic
since Sep 2026
Search engines
Awesomplete
since Sep 2024
Security
Cloudflare Bot Management
since Nov 2021
HSTS
since Sep 2022
Really Simple SSL & Security
since Apr 2024
reCAPTCHA
since Jan 2019
Static site generator
Tag managers
Google Tag Manager
since Jun 2018
UI frameworks
Angular Material
since Jan 2026
Animate.css
since Apr 2021
Bootstrap
since Aug 2018
Radix UI
since Mar 2026
SvelteKit
since Apr 2025
Tailwind CSS
since Apr 2022
UIKit
since Jan 2023
Vuetify
since Aug 2023
ZURB Foundation
since Dec 2019
Video players
YouTube
since Jun 2018
Web frameworks
CodeIgniter
since Jun 2022
Google Web Toolkit
since Dec 2022
Helix Ultimate
since Oct 2026
Microsoft ASP.NET
since Aug 2018
Nette Framework
since Jan 2019
Ruby on Rails
since Jun 2020
Shiny
since Oct 2025
Symfony
since Jun 2024
Yii
since Oct 2026
Web server extensions
Web servers
Apache HTTP Server
since Nov 2016
Apache Tomcat
since Aug 2018
Caddy
since Dec 2024
EZproxy
since Jul 2023
OpenResty
since Oct 2022
Webmail
Apple iCloud Mail
since Apr 2026
Google Workspace
since Aug 2022
Microsoft 365
since Aug 2022
RoundCube
since Aug 2022
Zimbra
since Oct 2022
Widgets
Wikis
WordPress plugins
Elementor Header & Footer Builder
since Oct 2026
Gutenberg
since Mar 2023
Jetpack
since Jan 2023
Jetpack Boost
since May 2024
Kadence WP Blocks
since Mar 2023
Moove GDPR Consent
since Aug 2025
Polylang
since Oct 2022
RankMath SEO
since Jun 2023
SiteOrigin Widgets Bundle
since Feb 2022
Smart Slider 3
since Aug 2022
Smash Balloon Instagram Feed
since Aug 2023
TablePress
since Jan 2023
The Events Calendar
since Jun 2023
ThemeIsle Menu Icons
since Feb 2022
W3 Total Cache
since Dec 2021
WP Fastest Cache
since Feb 2022
WP Featherlight
since Mar 2023
WP Rocket
since Aug 2018
WP-PageNavi
since Apr 2024
WordPress themes
ExtendThemes Mesmerize
since Apr 2022
Phlox
since Mar 2024
SiteOrigin Vantage
since Feb 2022
Twenty Fifteen
since Dec 2022
Twenty Twelve
since Jan 2023
Twenty Twenty
since Sep 2025
AI Crawlers
Doesn't name any of the 33 AI crawlers we track in its robots.txt. Catch-all rules (User-agent: *) restrict some paths for every crawler, AI or not. Checked Nov 2026.
- robots.txt found
- llms.txt not found
- ai.txt not found
- Nov 2026 *: Restricted (was Allowed)
- Oct 2026 *: Allowed (was Restricted)
- Oct 2026 *: Restricted (was Allowed)
- Oct 2026 * added to robots.txt
- Sep 2026 robots.txt appeared
- Sep 2026 * removed from robots.txt
AI Crawlers
No AI crawlers blocked
Audience
- 52% phone
- 45% desktop
- 3% tablet
Czechia
United States
India
Germany
Ukraine
Austria
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
8.33 / 10 · ranked #3,672 of all domains
4,620 referring domains · OpenPageRank
Core Web Vitals
| LCP | 0.5 s |
| INP | 75 ms |
| CLS | 0 |
| TTFB | 200 ms |
Real user p75, Chrome UX Report, Sep 2026.
Page
- Language: Czech (Czechia)
- Weight: 1.4 MB · 26 requests
- WordPress theme: hello-elementor · all themes
- Structured data: JSON-LD, OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Oct 2026.
Similar sites
Closest technology stacks among the highest-authority sites we track; "shared" counts the distinctive technologies in common.
Organisation
- Fyziologický ústav AV ČR (Ondřejov Observatory on Wikidata)
- Founded: 1898
- Country: Czech Republic
From the homepage's own structured data (Oct 2026) and Wikidata (CC0).
Infrastructure
- Registered Oct 1996 (30 years), renews Oct 2034
- Hosted on CESNET2 CESNET z.s.p.o. (147.231.163.240)
- DNS: cas.cz
- Email: Microsoft 365
- Email security: SPF (soft fail), no DMARC record, DNSSEC signed
- SSL: HARICA, RSA 2048, wildcard, expires May 2027
- Common Crawl link graph: rank 5,976, 1,176 hosts
- Verified with: Google, Microsoft 365
DNS records as swept Nov 2026, certificate as seen Nov 2026, registration from the registry's RDAP service. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| lib.cas.cz | 36 |
| www.iem.cas.cz | 27 |
| clb.ucl.cas.cz | 25 |
| www.icpf.cas.cz | 25 |
| openlab.bc.cas.cz | 24 |
| www.ig.cas.cz | 23 |
| www.ih.cas.cz | 23 |
| pm.ueb.cas.cz | 22 |
| ucl.cas.cz | 22 |
| ujc.cas.cz | 22 |
| langdpt.cas.cz | 21 |
| www.iic.cas.cz | 21 |
| longwood.ibot.cas.cz | 20 |
| techtransfer.cas.cz | 20 |
| www.img.cas.cz | 20 |
| www.ufa.cas.cz | 20 |
| cms.flu.cas.cz | 19 |
| lhr.ueb.cas.cz | 19 |
| mbu.cas.cz | 19 |
| fgu.cas.cz | 18 |
| labgis.ibot.cas.cz | 18 |
| www.pametnimista.usd.cas.cz | 18 |
| www.ucl.cas.cz | 18 |
| applebreeding.ueb.cas.cz | 17 |
Full technology history →
Report an incorrect detection
Recent changes
- detected Blitz Oct 2026
- detected Craft CMS Oct 2026
- detected Htmx Oct 2026
- detected Koko Analytics Oct 2026
- detected Sprig plugin Oct 2026
- detected Yii Oct 2026
- dropped Knockout.js Aug 2026
- dropped Polyfill Jul 2026
- dropped Preact Jul 2026
- dropped WPForms Jul 2026
- detected Bootstrap Icons May 2026
- dropped Express May 2026
- detected Apple iCloud Mail Apr 2026
- detected All in One SEO Feb 2026
- dropped Slider Revolution Feb 2026
- detected Astra Jan 2026
- dropped Glider.js Jan 2026
- dropped Microsoft Advertising Jan 2026
- dropped Plyr Jan 2026
- detected Redis Jan 2026
- detected Redis Object Cache Jan 2026
- dropped Vimeo Jan 2026